fix fatal error when deleting a channel with no conversations in it
Check recaptcha_response_field on join
Add recaptcha field
Add recaptcha definitions
Add recaptcha CSS

adapts reCaptcha design for esoTalk
Update config.defaults.php
Disable reCaptcha check if !recaptcha.key..

Disable reCaptcha check if config values recaptcha.key.private && recaptcha.key.public are not set (i.e. empty).
Don't display reCaptcha check if !recaptcha.key..
Merge pull request #1 from RIscRIpt/develop

Embedding reCaptcha into esoTalk